Be able to create a redis ring from universal options

[peczenyj]

Today we can't create a ring in universal ctor / universal options

There is a clash of Addrs field name, that is a slice of strings for all flavors of redis universal client and the ring, that uses a map[string]string

not anymore, using AddressMap field we can create a Ring will full colors :)

this is a cleaning of previous PR #2727 2727

[ndyakov]

@peczenyj thank you for the contribution. I would argue Ring is a specific client type implemented by the library and not universally supported. Also, adding AddressMap and having Addrs fields together make the usage of UniversalClient more confusing. I do think that Ring should be separate from the cluster and standalone clients (e.g. UniversalClient)